Leonard is the chosen of an
Elven-made sword. The sword's wish is "To protect mankind." The weapon is normally sealed inside of
a ring. All Leonard has to do is hold out his hand and will for the sword to appear, and the weapon will materialize. If he lets it go, it will disappear to be called from the ring again. The ring is permanently bound to his middle finger. Killing him or severing the finger will allow it to be removed, transferring ownership to whoever defeated him. The sword is indestructible, and will thus always be as sharp as the day it was created. It can stab through a car. It also has a magical aura around it that repels energy-based attacks. So if a wizard lobs a fireball at Leon, he can bat it back at them. The sword counts as a holy symbol, and is thus effective against things like vampires and demons. When an enemy (someone who is intent on harming Leonard) is nearby, it glows with blue flame.
Ownership of the ring makes Leonard stronger. It augments the strength he already has, thus putting his strength, speed, and durability on the same level as a Lycan or vampire with a similar level of physical ability. Finally, wearing the ring protects him from magic that would effect his mind and perceptions.